Drill-chuck.



Nd. 762,650. PATENTED JUNE 14, 1904. T. E. OBRIEN.

DRILL CHUCK.

APPLIOATION FILED 0013.19. 1903.

N0 MODEL.

)kW 18 TEOZw'en,

Q. a zyw lg'i'nefise a. W v RU 277 2? a UNITED STATES Patented June 14,1904.

PATENT OFFICE.

THOMAS E. OBRIEN, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF THREE- EIGHTHSTO JOSEPH F. EATON, OF BOSTON, MASSACHUSETTS.

DRILL-CHUCK.

s?EG[FICATION forming part of Letters Patent No. 762,650, dated June 14,1904.

Application filed October 19,1903. Serial No. 177,550. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS E. O?BRIEN, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Drill-Chucks, of

which the following is a specification.

This invention relates to drill-chucks; and its objects are to provide amaximum degree of simplicity consistent with durability and effectiveoperation and to so construct the chuck that it may be made by simpleand inexpensive mechanical operations and assembled with maximum easeand rapidity.

Of the accompanying drawings, Figure 1 represents an axial section of adrill-chuck embodying my invention. Fig. 2 represents a section on' line2 2 of Fig. 1. Fig. 3 represents a section on line 3 3 of Fig. 1. Fig.l: represents a side elevation of the chuck-bod y. Fig. 5 represents aperspective view of one of the jaws.

The same reference characters indicate the same parts in all thefigures.

In the drawings, 10 represents an arbor whose rear end is adapted to befixed to the spindle of a lathe or to constitute the spindle of ahand-drill or other tool and whose forward portion is fixed by a pin 16in an axial aperture in a chuck-b0dy 11. The latter is externallythreaded at 12 to receive the c0m plementally-threaded shell 13, thelatter being internally coned on its forward end and acting on theinclined backs of the radially-movable jaws 14:, as is usual indrill-chucks.

15 represents jaw-guiding grooves formed in the chuck-body and extendingfrom the periphery thereof at a point back of the forward end of thearbor 10 to said arbor, so as to expose the forward end of said arborwithin the chuck-body. By thus constructing the grooves I am enabled tomake them by a continuous operation, such as milling with a rotary tool,the grooves being formed in the body before the arbor 10 is inserted.The exposure of the end of the arbor enables said end to act as anabutment for the jaws to resist the backward thrust of the latter.

The jaws are retained against forward movement by pins 17, fixed in'thechuck-body 11 and projecting into the jaw-guiding grooves 15 and intoradial grooves 18, formed one in 'sembled by reason of thisconstruction.

each jaw 14 in the side face of said jaw, the opposite side face beingleft plain. The jaws are removable from the chuck-body by an outwardmovement through the jaw-guiding grooves to release them from the pins17, and

it is evident that the chuck can be quickly as- By constructing andmounting the pins and jaw grooves in the manner indicated the pins aregiven a secure anchorage, and it is apparent that the jaw-grooves may beeasily made by a saw-cut or milling-tool or otherwise.

By virtue of the described construction of the chuck it possesses amaximum degree of 5 simplicity and may be made very cheaply.

I claim 1. In a drill-chuck, an arbor whose forward end constitutes anabutment for the jaws, a threaded body fast on said arbor and formed 7with jaw-guiding grooves extending to the arbor from points ontheperiphery of said body back of the forward end of the arbor so as toexpose said end within the chuck-body, radially-movable jaws mounted insaid grooves and abutting said arbor end, and a threaded shell screwingon the body and having a wedging action on the jaws.

2. In a drill-chuck, a threaded chuck-body formed with a radialjaw-guiding groove, a jaw mounted and radially movable in said grooveand formed with a groove in its side face, a pin fixed in saidchuck-body and projecting into the groove in the jaw to retain the jawagainst forward displacement, said pin and 5 jaw-groove permittingremoval of the jaw outwardly from the jaw-guiding groove, and a threadedshell screwing on the chuck-body for operating said jaw.

3. In a drill-chuck, a threaded chuck-body 9 formed with a radialjaw-guiding groove, a jaw mounted and radially movable in said groove,said jaw having a plain side face and a grooved opposite side face, andon one side only of the jaw-guiding groove a pin fixed in the chuck bodyand projecting into the jaw-groove.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

THOMAS E. OBRIEN.

Witnesses:

R. M. PIERSON, A. O. RATIGAN.

